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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <h1 class="blue bd">我的故事</h1>
    <div class="digest">
         <p id="first-p">这里是一个<span>段落</span></p>
         <p>这是第二个段落</p>
         <p>这是第三个段落</p>
    </div>
   <p class="blue">另一个p</p>
   <style>
    /*.标签.*/
    p{
       color: red; 
    }
    /*.类.*/
    .blue{
        color: blue;

    }
    .bd{
        border: 1px rgb(157,97,97) solid;
    }
    /*.ID.*/
    #first-p{
        text-decoration:underline ;
        font-size: 2em;
    }
    /*.通配.*/
    *{
        margin:0;
        padding:0;
    }
    .digest *::first-letter{
        font-size: 2.5em;
    }
   </style>
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